B.
Access

 (1)  
Location Zones
 133 Wing Center Section (Left)
 134 Wing Center Section (Right)
 500 Wing (Left)
 600 WIng (Right)

 C.
Replace the Electrical Bonding Jumper

 S 012-007
 (1)  
Remove the bonding jumper.

 (a)  
Keep all the parts necessary for the installation of the bonding jumper.

 S 422-008
 (2)  For the bonding jumpers used to bond electrical equipment, follow the applicable installation procedure in the AMM.
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747-400 MAINTENANCE MANUAL
 S 422-009
 (3)  
For the bonding jumpers used to bond mechanical equipment or tubing, install the new bonding jumper and hardware (SWPM 20-20-00).

 (a)  
Make sure the mating surface(s) are correctly prepared.

 (b)  
Make sure the bonding jumper installation gives adequate clearance from the structure, tubing or all fuel system parts.

 NOTE: This will prevent abrasion.
____
 S 282-010
 (4)  
Do the subsequent procedure.

 D.
Electrical Integrity Check of the Fuel System Bond Path

 NOTE: SWPM 20-20-00 defines the measurement processes necessary for
____ installation of electrical bonding hardware. The fuel system tubing and components often incorporate multiple electrical bonds in series between the component and the primary structure. The measurement of the tubing or component bond is a separate requirement.
 S 222-011
 (1)  
For bonding jumper hardware installations, do the resistance measurement for electrical integrity (SWPM 20-20-00).

 S 222-012

 (2)  
For the fuel system tubing or components, do these steps:

 (a)  
Measure the total resistance from the tubing or component, to the adjacent primary structure.

 (b)  
Make sure the resistance is not more than 0.10 ohms.

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747-400 FAULT ISOLATION/MAINT MANUAL
STORAGE
COMPONENT  FIG. 102 SHT  QTY  ACCESS/AREA  REFERENCE 
ACTUATOR - VALVE (2A), INBD NO. 2 RESERVE TANK TRANSFER, V432  12  1  L REAR SPAR TO TRAILING EDGE  28-16-01 
ACTUATOR - VALVE (3A), INBD NO. 3 RESERVE TANK TRANSFER, V430 12  1  R REAR SPAR TO TRAILING EDGE  28-16-01 
ACTUATOR - VALVE, NO. 1 MAIN TANK TRANSFER, V55 12  1  573AB, L REAR SPAR TO INBD AILERON LEADING EDGE  28-16-04 
V50 ACTUATOR - VALVE, NO. 4 MAIN TANK TRANSFER,  12  1  673AB, R REAR SPAR TO INBD AILERON LEADING EDGE  28-16-04 
ACTUATOR - VALVE (2B), OUTBD NO. 2 RESERVE TANK TRANSFER, V433 12  1  L REAR SPAR TO TRAILING EDGE  28-16-01 
ACTUATOR - VALVE (3B), OUTBD NO. 3 RESERVE TANK TRANSFER, V431 12  1  R REAR SPAR TO TRAILING EDGE  28-16-01
ADAPTER - VALVE (2A), INBD NO. 2 RESERVE TANK TRANSFER 12  1  552GB, L FRONT SPAR TO REAR SPAR RESERVE TANK, L REAR SPAR TO TRAILING EDGE  28-16-03 
ADAPTER - VALVE (3A), INBD NO. 3 RESERVE TANK TRANSFER  12  1  652GB, R FRONT SPAR TO REAR SPAR RESERVE TANK, R REAR SPAR TO TRAILING EDGE  28-16-03 
ADAPTER - VALVE, NO. 1 MAIN TANK TRANSFER  12  1  545BB, L MID SPAR TO REAR SPAR INBD MAIN TANK, 573AB, L REAR SPAR TO INBD AILERON LEADING EDGE  28-16-06 
ADAPTER - VALVE, NO. 4 MAIN TANK TRANSFER  12  1  645BB, R MIDSPAR TO REAR SPAR INBD MAIN TANK, 673AB, R REAR SPAR INBD AILERON LEADING EDGE  28-16-06 
ADAPTER - VALVE (2B), OUTBD NO. 2 RESERVE TANK TRANSFER 12  1  552GB, L FRONT SPAR TO REAR SPAR RESERVE TANK, L REAR SPAR TO TRAILING EDGE  28-16-03 
ADAPTER - VALVE (3B), OUTBD NO. 3 RESERVE TANK TRANSFER 12 1 652GB, R FRONT SPAR TO REAR SPAR RESERVE TANK, R REAR SPAR TO TRAILING EDGE  28-16-03
　
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